said by Snowy:
The only way to guarantee that won't happen is to physically disconnect from the net.
Disconnecting doesn't necessarily mean a call home won't occur on reconnection but it can & should be considered as a legit security layer.
The cable modem to my iMac sits within arm's reach. Whenever installing or using a new or unfamiliar program, or am going to be in read-only mode for a while, I simply disconnect the ethernet wire. Been doing this for years.